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USS Elk River (IX 501) in December 1968.
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Class: ELK RIVER (IX 501)
Design: Navy LSMR 501
Displacement (tons): 1,280 full
Dimensions (feet): 230' oa x 50' x 9.5'
Armament: none
Accommodations: 20 officers and 51 enlisted
Speed (kts.): 11
Propulsion (HP): 1,400
Machinery: 2 diesels, 2 screws

Construction:
IXNameReclasBuilderKeelLaunchSvc
501ELK RIVER1 Apr 1967Brown SB, Houston24 Mar 194521 Apr 1945COM/SRV

Disposition:
IXNameTInactStrikeDisposalFateMA Sale
501ELK RIVERDECOM13 Aug 199924 Feb 2001Exercise target--

Class Notes:
[SAC-15] Converted to a test range support ship in 1967-68 by Avondale Shipyards and the San Francisco Naval Shipyard. The basic 203.5 foot LSMR hull was lengthened and eight-foot sponsons were added to both sides to improve the ship's stability and increase working space. A superstructure was added forward and an open center well was provided for lowering and raising equipment. A 65-ton gantry crane ran on tracks above the opening to handle small submersibles and diver transfer chambers. An active precision positioning system was installed for position holding without mooring. She tested the prototype Mk II Deep Diving System that was installed on the two PIGEON (ASR 21) class ships. This system could support eight divers operating at depths to at least 1,000 feet in helium oxygen saturation conditions.

Ship Notes:
IXNameMANotes
501ELK RIVER(ex-LSMR 501, compl. 24 May 1945). Given a river name on 1 Oct 1955 along with the other LSMRs. On 26 March 1967 effective 1 April 1967 ELK RIVER (LSMR 501) was reclassified to IX 501. Operated by NOSC at San Diego as a test and training ship for deep-sea diving and salvage from 1969 to 1986. The large gantry crane and other equipment were removed in October 1986 and the ship was reduced to a barracks hulk.

Page Notes:
Compiled: 19 Oct 2021
© Stephen S. Roberts, 2021
Sources: DB, Maroon